content: /*
   * Copyright 2011-2016 David Karnok
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package ix;
  
  import java.util.Iterator;
  
  import org.junit.*;
  
  public class TransformTest {
  
      @Test
      public void normal() {
          Ix<Integer> source = Ix.just(1).transform(new IxTransform<Integer, Integer>() {
              @Override
              public int moveNext(Iterator<Integer> it, IxConsumer<? super Integer> out) {
                  if (it.hasNext()) {
                      out.accept(it.next() + 10);
                      return IxTransform.NEXT;
                  }
                  out.accept(12);
                  return IxTransform.LAST;
              }
          });
  
          IxTestHelper.assertValues(source, 11, 12);
  
          IxTestHelper.assertNoRemove(source);
      }
  
      @Test
      public void stop() {
          Ix<Integer> source = Ix.just(1).transform(new IxTransform<Integer, Integer>() {
              @Override
              public int moveNext(Iterator<Integer> it, IxConsumer<? super Integer> out) {
                  return IxTransform.STOP;
              }
          });
  
          IxTestHelper.assertValues(source);
  
          IxTestHelper.assertNoRemove(source);
      }
  
      @Test
      public void doubleNext() {
          try {
              Ix<Integer> source = Ix.just(1).transform(new IxTransform<Integer, Integer>() {
                  @Override
                  public int moveNext(Iterator<Integer> it, IxConsumer<? super Integer> out) {
                      out.accept(1);
                      out.accept(2);
                      return IxTransform.NEXT;
                  }
              });
  
              IxTestHelper.assertValues(source);
  
              Assert.fail("Failed to throw IllegalStateException");
          } catch (IllegalStateException ex) {
              Assert.assertEquals("Value already set in this turn!", ex.getMessage());
          }
      }
  
      @Test
      public void returnNextWithoutValue() {
          try {
              Ix<Integer> source = Ix.just(1).transform(new IxTransform<Integer, Integer>() {
                  @Override
                  public int moveNext(Iterator<Integer> it, IxConsumer<? super Integer> out) {
                      return IxTransform.NEXT;
                  }
              });
  
              IxTestHelper.assertValues(source);
  
              Assert.fail("Failed to throw IllegalStateException");
          } catch (IllegalStateException ex) {
              Assert.assertEquals("No value set!", ex.getMessage());
          }
      }
  }
  